This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A201024 #9 Aug 27 2012 11:06:27 %S A201024 9,33,91,119,133,1119,1133,1191,1313,1331,1911,3113,3131,3311,9111, %T A201024 11133,11191,11313,11331,11911,13113,13131,13311,19111,31113,31131, %U A201024 31311,33111,91111,111133,111313,111331,111911,113113,113311,119111,131131,133111,191111,311113 %N A201024 Composite numbers whose multiplicative digital root is 9. %C A201024 Also composite numbers whose product of digits is 9. Complement of A107695 with respect to A034056. %e A201024 Number 133 is in sequence because 1*3*3=9. %t A201024 Select[Range[320000],!PrimeQ[#]&&Times@@IntegerDigits[#]==9&] (* _Harvey P. Dale_, Aug 27 2012 *) %Y A201024 Cf. A107695 (primes whose multiplicative digital root is 9), A034056 (numbers whose multiplicative digital root is 9). %K A201024 nonn,base %O A201024 1,1 %A A201024 _Jaroslav Krizek_, Nov 25 2011